The 6354RDSO holster is designed for firearms with red dot sights. Its Automatic Locking System (ALS) secures the firearm. Unlike Safarilands RDS series, the RDSO has an open pocket that protects the optic and does not use a flip-up dust cover. This holsters has the QLS 19 Locking Fork installed. The QLS 19 fork can be used any mounting platform (leg shroud, belt loop, etc.) that has the QLS 22 Receiver Plate installed. Specifications for Safariland 6354RDSO ALS Glock Tactical OWB Holster w/ QLS19 Fork: Manufacturer: Safariland Gun Make: Glock Holster Type: Outside the Waistband Holster Holster Material: SafariLaminate Accessory Attachment System: QLS 19 Fork Application: Tactical Fastener/Closure Type: ALS - Automatic Locking System Condition: New Age Group: Adults Features of Safariland 6354RDSO ALS Glock Tactical OWB Holster w/ QLS19 Fork ALS (Automatic Locking Systems) secures weapon once holstered; simple straight up draw once release is deactivated Open-top design without SLS for quick retrieval of weapon Includes QLS 19 Locking Fork ONLY For use with red dot optic-equipped weapons SafariLaminate thermal-molded construction protects handgun and sights Suede lined to protect handgun's finish Package Contents: Safariland 6354RDSO ALS Glock Tactical OWB Holster w/ QLS19 Fork What firearm models does the manufacturer say Safariland 6354RDSO ALS Glock Tactical OWB Holster w/ QLS19 Fork is compatible with? The manufacturer says that Safariland 6354RDSO ALS Glock Tactical OWB Holster w/ QLS19 Fork is compatible with Glock 19 MOS, Glock 47, Glock 34, Glock 35, Glock 17 MOS